Configuring The As_Path Attribute - HP A8800 Configuration Manual

Step
4. Specify the router as the next
hop of routes sent to a peer/peer
group.

Configuring the AS_PATH attribute

In general, MBGP checks whether the AS_PATH attribute of a route from a peer contains the local AS
number. If yes, it discards the route to avoid routing loops.
To configure the AS_PATH attribute:
Step
1. Enter system view.
2. Enter BGP view.
3. Enter IPv4 MBGP address family view.
4. Configure the AS_PATH attribute.
Tuning and optimizing MBGP networks
This task involves resetting MBGP connections and configuring load balancing.
Configuration prerequisites
You must configure BGP basic functions before configuring this task.
Command
peer { group-name | ip-address }
next-hop-local
Command
system-view
bgp as-number
ipv4-family multicast
•
Specify the maximum number
of times the local AS number
can appear in routes from the
peer/peer group:
peer { group-name |
ip-address } allow-as-loop
[ number ]
•
Disable BGP from considering
the AS_PATH during best route
selection:
bestroute as-path-neglect
•
Configure updates to a
peer/peer group to not keep
private AS numbers:
peer { group-name |
ip-address } public-as-only
229
Remarks
Optional.
By default, the next hop of
routes sent to a MBGP
EBGP peer/peer group is
the advertising router, but
that of routes sent to a
MBGP IBGP peer/peer
group is not.
Remarks
N/A
N/A
N/A
Optional.
By default:
•
The local AS number
cannot appear in routes
from a peer/peer
group.
•
BGP considers
AS_PATH during best
route selection.
•
BGP updates carry
private AS numbers.